Wavefront export with [Vertex/texture-coordinate/normal] face definitions
There are several objects included in the one file, all vertices listed are numbered in the order they exist in the file, each object then uses a range of these vertices for it's faces.

You will find that the objects and it's related items in your exported file will be in a different order than the original, therefore each object uses a different range of vertices. You should find that the total number of vertex lines, face lines etc. should all match up, just that each object is using different numbers.